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EP3239271B1 - Élément électroluminescent organique - Google Patents

Élément électroluminescent organique Download PDF

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Publication number
EP3239271B1
EP3239271B1 EP15873577.9A EP15873577A EP3239271B1 EP 3239271 B1 EP3239271 B1 EP 3239271B1 EP 15873577 A EP15873577 A EP 15873577A EP 3239271 B1 EP3239271 B1 EP 3239271B1
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Prior art keywords
group
organic electroluminescent
electroluminescent element
formula
layer
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EP15873577.9A
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German (de)
English (en)
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EP3239271A1 (fr
EP3239271A4 (fr
Inventor
Min-Sik Eum
Ho-Cheol Park
Chang Jun Lee
Tae Hyung Kim
Jiyi KIM
Youngmi BEAK
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Solus Advanced Materials Co Ltd
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Solus Advanced Materials Co Ltd
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Application filed by Solus Advanced Materials Co Ltd filed Critical Solus Advanced Materials Co Ltd
Priority to EP20152476.6A priority Critical patent/EP3660006B1/fr
Priority to EP20200773.8A priority patent/EP3798210B1/fr
Priority to EP20200771.2A priority patent/EP3789381B1/fr
Priority claimed from PCT/KR2015/014021 external-priority patent/WO2016105050A1/fr
Publication of EP3239271A1 publication Critical patent/EP3239271A1/fr
Publication of EP3239271A4 publication Critical patent/EP3239271A4/fr
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Definitions

  • the present invention relates to an organic electroluminescent element comprising an organic layer.
  • the application of a current or voltage across two opposite electrodes induces the injection of holes from the anode and electrons from the cathode into an organic layer.
  • the injected holes and electrons recombine with each other to generate excitons which then return to the ground state, emitting light.
  • the organic electroluminescent elements may be classified into fluorescent light-emitting elements in which decay of singlet excitons contributes to the production of light through spontaneous emission and phosphorescent light-emitting elements in which decay of triplet excitons contributes to the production of light through spontaneous emission.
  • Electron spin of excitons formed by the recombination of electrons and holes may either be in a singlet state or a triplet state at a ratio of 25 % singlet state: 75% triplet state.
  • Fluorescent light-emitting elements in which light is emitted by singlet exciton theoretically does not exceed 25% in internal quantum efficiency and 5% in external quantum efficiency, based on the formation rate of a singlet excitons.
  • Phosphorescent light-emitting elements in which light is emitted by triplet exciton exhibits emission efficiency four times as high as that of fluorescent light-emitting elements.
  • phosphorescent light-emitting elements are higher in emission efficiency than fluorescent light-emitting elements, as described above, on a theoretical basis, a host that meets the color purity of deep blue and the high efficiency required in blue phosphorescent light-emitting elements is underdeveloped so that blue fluorescent light-emitting elements rather than blue phosphorescent light-emitting elements have predominantly been employed in products thus far.
  • KR-A-20140101661 describes 9,9-dimethylfluorenes which are linked to a pyrimidine or triazine ring through a phenyl group, and the pyrimidine or triazine is substituted by two phenyl groups one of which is substituted by dibenzofuran or dibenzothiophene.
  • US-A-2014001456 describes 9,9-dimethyl-fluorene which is linked to a 2,6-diphenyl-pyrimidin-4-yl group through a phenylene group, in which the 6-phenyl group is substituted by dibenzofuran.
  • WO-A-2014023388 describes compounds which fall under the scope of claim 1 in which the ring formed by Z1-Z5 has two identical CR4 groups.
  • a purpose of the present invention is to provide an organic electroluminescent element outstanding in terms of driving voltage, emission efficiency, and lifespan.
  • the present invention provides an organic electroluminescent element comprising: an anode; a cathode; and an organic layer interposed therebetween, wherein the organic layer comprises a light-emitting layer, an electron transport layer, and a lifetime enhancement layer interposed between the light-emitting layer and the electron transport layer, the lifetime enhancement layer comprises a compound represented by the following Formula 1: wherein,
  • an electron transport layer, or an electron injection layer all of which comprises a compound having specific physical properties is introduced thereinto, an organic electroluminescent element exhibiting outstanding driving voltage, emission efficiency, and lifespan can be provided.
  • the organic electroluminescent element of the present invention is applied thereto, a display panel improved in performance and lifespan can be provided.
  • Fig. 1 is a schematic cross-sectional view illustrating an organic electroluminescent element according to one embodiment of the present invention.
  • An embodiment of the present invention provides an organic electroluminescent element, comprising an anode; a cathode; and an organic layer interposed therebetween, wherein the organic layer comprises a light-emitting layer, an electron transport layer, and a lifetime enhancement layer interposed between the light-emitting layer and the electron transport layer, the lifetime enhancement layer comprises a compound represented by the following Formula 1: wherein,
  • Fig. 1 depicts an organic electroluminescent element according to an embodiment of the present invention.
  • the organic electroluminescent element comprises: an anode 100; a cathode 200; and an organic layer 300 interposed therebetween.
  • the anode 100 functions to inject holes into the organic layer 300.
  • the material of the anode 100 is not particularly limited, but may be a metal such as vanadium, chromium, copper, zinc, gold, etc.; an alloy thereof; a metal oxide such as zinc oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide (IZO); a combination of metal and oxide such as ZnO:Al or SnO 2 :Sb; a conductive polymer such as polythiophene, poly(3-methylthiophene), poly[3,4-(ethylene-1,2-dioxy)thiophene] (PEDT), polypyrrole, polyaniline, etc.; and carbon black.
  • No particular limitations are further imparted to the fabrication method of the anode 100, and non-limitative examples include applying an anode material on a substrate made of a silicon wafer, quartz, a glass plate, a metal plate, or a plastic film.
  • the cathode 200 functions to inject electrons into the organic layer 300.
  • a material available for the cathode include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin, lead, etc; an alloy thereof; and multilayer materials such as LiF/Al, LiO 2 /Al, etc. Any method that is known in the art may be used for the fabrication of the cathode 200 without particular limitations.
  • the organic layer 300 may particularly include at least one selected from the group consisting of a hole injection layer 301, a hole transport layer 302, a light-emitting layer 303, a lifetime enhancement layer 304, an electron transport layer 305, and an electron injection layer 306.
  • the organic layer 300 may more particularly include all of the layers.
  • the hole injection layer 301 and the hole transport layer 302 contribute to the migration of the holes injected from the anode 100 into the light-emitting layer 303.
  • Materials available for the hole injection layer 301 and the hole transport layer 302 are not particularly limited if they have low hole injection barriers and high hole motility, and non-limitative examples thereof include arylamine derivatives.
  • the light-emitting layer 303 may contain a host and a dopant, and may particularly contains 70 to 99.9 % by weight of host and 0.1 to 30 % by weight of dopant.
  • the light-emitting layer 303 may particularly contain a host in an amount of 70 to 99.9 % by weight and a dopant in an amount of 0.1 to 30 % by weight and more particularly a host in an amount of 80 to 99 % by weight and a dopant in an amount of 1 to 20 % by weight.
  • Non-limitative examples of the host include alkali metal complexes; alkaline earth metal complexes; and fused aromatic ring derivatives. Particularly, preference is made for a host that can increase the emission efficiency and lifespan of the organic electroluminescent element, as exemplified by aluminum complexes, beryllium complexes, anthracene derivatives, pyrene derivatives, triphenylene derivatives, carbazole derivatives, dibenzofuran derivatives, and dibenzothiophene derivatives.
  • the dopant contained in the light-emitting layer 303 is not particularly limited if it is known in the art, and non-limitative examples thereof include anthracene derivatives, pyrene derivatives, arylamine derivatives, and iridium (Ir)- or platinum (Pt)-containing metal complex compounds.
  • the light-emitting layer 303 may consist of one layer (monolayer structure) or a plurality of layers (multilayer structure).
  • a multilayer structure of the light-emitting layer 303 may allow the organic electroluminescent element to emit light of various colors. For instance, when a plurality of light-emitting layers is positioned between the hole transport layer 302 and the lifetime enhancement layer 304, an organic electroluminescent element can emit light of a mixed color.
  • the light-emitting layers may be made of heterogeneous materials.
  • a multilayer structure of the light-emitting layer 303 although increasing the driving voltage, makes the current values constant within the organic electroluminescent element, thus improving as much the emission efficiency of the organic electroluminescent element as the number of the light-emitting layers.
  • the lifetime enhancement layer 304 aims to improve the lifespan of the organic electroluminescent element, and is provided between the light-emitting layer 303 and the electron transport layer 305.
  • No particular limitations are imparted to a material of the lifetime enhancement layer 304, and a bipolar compound that has both an electron withdrawing group (EWG) with high electron withdrawing ability and an electron donating group (EDG) with high electron donating ability may be preferably used.
  • EWG electron withdrawing group
  • EDG electron donating group
  • the compound represented by Formula 1 is used as a material of the lifetime enhancement layer 304.
  • the bipolar compound particularly has an ionization potential of 5.5 eV or higher, more particularly 5.5 to 7.0 eV, and most particularly 5.6 to 6.6 eV. Further the bipolar compound particularly has an energy gap between HOMO and LUMO (E HOMO -E LUMO ) of higher than 3.0 eV and more particularly 2.8 to 3.8 eV. In addition, the bipolar compound particularly has a triplet energy of 2.3 eV or higher, more particularly 2.3 to 3.5 eV, and most particularly 2.3 to 3.0 eV. Furthermore, the bipolar compound particularly has a gap between singlet energy and triplet energy of less than 0.7 eV and more particularly 0.01 to 0.7 eV. Given a compound with an ionization potential of 5.5eV or higher, the lifetime enhancement layer 304 can prevent the diffusion or migration of holes into the electron transport layer 305, thus contributing to improvement in the lifespan of the organic electroluminescent element.
  • the presence of the lifetime enhancement layer 304 that comprises a bipolar compound with an ionization potential of 5.5 eV or higher prevents holes from diffusing or moving to the electron transport layer 305, improving the lifespan of the organic electroluminescent element. That is, holes are blocked by the high energy barrier of the lifetime enhancement layer 304 and thus remain within the light-emitting layer 303.
  • the light-emitting layer 303 is made of a red phosphorescent material, an ionization potential of 5.5 eV or higher may be allowed without problems for the bipolar compound contained in the lifetime enhancement layer 304.
  • the use of a green or blue phosphorescent material may particularly require an ionization potential of 6.0 eV or higher for the bipolar compound.
  • the bipolar compound has an energy gap between HOMO and LUMO (E HOMO -E LUMO ) of higher than 3.0 eV, a triplet energy of 2.3 eV or higher, and a gap between singlet energy and triplet energy of less than 0.7 eV.
  • E HOMO -E LUMO energy gap between HOMO and LUMO
  • the use of such a compound in the lifetime enhancement layer 304 can prevent the exciton formed in the light-emitting layer 303 from diffusing into the electron transport layer 305 and can interrupt light emission at an interface between the light-emitting layer 303 and the electron transport layer 305. Thanks to the bipolar compound, as a result, the organic electroluminescent element can be prevented from exhibiting spectrum color mixing and can be more stabilized, thus increasing in lifespan.
  • the bipolar compound bears both an electron withdrawing group (EWG) of high electron withdrawing ability and an electron donating group (EDG) of high electron donating ability, with spatial separation between respective electron clouds of HOMO and LUMO. Due to this, the gap between triplet energy and singlet energy ( ⁇ Est) of the compound is as small as less than 0.7 eV, so that the compound can have high triplet energy (T1) even when the energy gap between HOMO and LUMO (E HOMO -E LUMO ) exceeds 3.0 eV.
  • EWG electron withdrawing group
  • EDG electron donating group
  • the light-emitting layer 303 is made of a red phosphorescent material, a triplet energy of 2.3 eV or higher may be allowed without problems for the bipolar compound contained in the lifetime enhancement layer 304.
  • the use of a green or a blue phosphorescent material may particularly require a triplet energy of 2.5 eV or higher and 2.7 eV or higher, respectively, for the bipolar compound.
  • Both the hole mobility and the electron mobility of the bipolar compound are particularly 1 ⁇ 10 -6 cm 2 /V ⁇ s or higher.
  • the use of the compound in the lifetime enhancement layer 304 prevents the injection of electrons from being delayed compared to the number of the holes injected from the anode 100, thus improving the lifespan of the organic electroluminescent element.
  • the bipolar compound contained in the lifetime enhancement layer 304 in accordance with the present invention exhibits a hole motility of 1 ⁇ 10 -6 cm 2 /V ⁇ s or greater at room temperature due to the electron donating group (EDG) and an electron motility of 1 ⁇ 10 -6 cm 2 /V ⁇ s or greater at room temperature due to the electron withdrawing group (EWG).
  • EDG electron donating group
  • EWG electron withdrawing group
  • such compounds can effectively inject electrons into the light-emitting layer 303.
  • the smooth injection of electrons into the light-emitting layer 303 increases efficiency in the formation of excitons in the light-emitting layer 303, thus prolonging the lifespan of the organic electroluminescent element.
  • the bipolar compound particularly has a framework in which a fluorene moity is bonded to a 6-membered heterocyclic ring through a linker (phenylene, biphenylene or terphenylene).
  • the bipolar compound may be a compound represented by Formula 1.
  • the lifetime enhancement layer 304 comprises a compound represented by Formula 1, wherein preferably the electron transport layer 305, and/or the electron injection layer 306 can also comprises a compound represented by Formula 1.
  • the compound represented by Formula 1 may be embodied by one of the compounds represented by the following Formulas 2 to 4. wherein, R a , R b , R 1 to R 3 , Z 1 to Z 5 , c, d, and e are each the same as defined in Formula 1.
  • the structure (substituent) represented by (* is a site where to bond to L) is particularly embodied by one of the structures (substituents) represented by the following C-1 to C-8 and C-10 to C-15.
  • the compound, represented by Formula 1 of the present invention is those represented by the following Formula 5: wherein, R a , R b , R 1 to R 4 , L, c, d, e, m, and n are the same each as defined in Formula 1, and considering properties of organic electroluminescent elements, R 4 's in the compound represented by Formula 5 are the same. That is, identical R 4 's give a symmetrical structure to the compound.
  • R a and R b in the compound represented Formula 1 of the present invention can beeach independently a methyl group or a phenyl group, or bond each other to form a fused ring represented by (* is a site where to bond).
  • R 1 to R 3 can be each independently selected from the group consisting of a hydrogen, a deuterium, a C 1 -C 40 alkyl group, a C 6 -C 60 aryl group, a heteroaryl group having 5 to 60 nuclear atoms, and a C 6 -C 60 arylamine group.
  • m and n are each an integer of 1 to 3, and particularly m is 1 and n is 1 or 2.
  • L can be a single bond, phenylene group, biphenylene group, or terphenylene group.
  • the linker L is particularly selected from the group consisting of the structures represented by the following L-1 to L-9 (* is a site where to bond).
  • the compounds, represented by Formula 1, of the present invention may be selected from the group consisting of compounds represented by the following Formulas LE-01 to LE-12:
  • alkyl refers to a monovalent substituent derived from linear or branched saturated hydrocarbon of 1 to 40 carbon atoms.
  • alkyl include, but are not limited to, methyl, ethyl, propyl, isobutyl, sec-butyl, pentyl, iso-amyl, hexyl, and the like.
  • alkenyl refers to a monovalent substituent derived from a linear or branched unsaturated hydrocarbon of 2 to 40 carbon atoms with one or more carbon-carbon double bonds, as exemplified by, but not limited to, vinyl, allyl, isopropenyl, 2-butenyl, and the like.
  • alkynyl refers to a monovalent substituent derived from a linear or branched unsaturated hydrocarbon of 2 to 40 carbon atoms with at least one carbon-carbon triple bond, as exemplified by, but not limited to, ethynyl, 2-propynyl, and the like.
  • aryl denotes a monovalent substituent derived from an aromatic hydrocarbon of 6 to 60 carbon atoms with a single ring or a combination of two or more rings in which two or more rings may simply be pendant to each other or fused together.
  • aryl include, but are not limited to, phenyl, naphthyl, phenantryl, anthryl, etc.
  • heteroaryl denotes a monovalent substituent derived from a mono- or polyheterocyclic aromatic hydrocarbon of 5 to 60 nuclear atoms in which at least one, particularly one to three carbon atoms of the ring are substituted by a heteroatom such as N, O, S, or Se. Two or more rings of the heteroaryl, if present, may simply be pendant to each other or fused together or to an aryl group.
  • heteroaryl examples include 6-membered monocyclic rings such as pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, and triazinyl; polycyclic rings such as phenoxathienyl, indolizinyl, indolyl, purinyl, quinolyl, benzothiazole, and carbazolyl; 2-furanyl; N-imidazolyl; 2-ixosazolyl; 2-pyridinyl; and 2-pyrimidinyl, but are not limited thereto.
  • aryloxy refers to a monovalent substituent represented by RO- wherein R denotes an aryl of 6 to 60 carbon atoms, as exemplified by, but not limited to, phenyloxy, naphthyloxy, diphenyloxy, etc.
  • alkyloxy refers to a monovalant substituent represented by R'O- wherein R' means an alkyl of 1 to 40 carbon atoms and is construed to include a linear, branched or cyclic structure and examples of which include, but are not limited to, methoxy, ethoxy, n-propoxy, 1-propoxy, t-butoxy, n-butoxy, pentoxy, etc.
  • arylamine refers to an amine group substituted with an aryl of 6 to 60 carbon atoms.
  • cycloalkyl refers to a monovalent substituent derived from a mono- or polycyclic non-aromatic hydrocarbon of 3 to 40 carbon atoms, examples of which include cyclopropyl, cyclopentyl, cyclohexyl, norbornyl, and adamantyl, but are not limited thereto.
  • heterocycloalkyl refers to a monovalent substituent derived from a non-aromatic hydrocarbon of 3 to 40 nuclear atoms in which at least one, particularly one to three carbon atoms of the ring are substituted by a heteroatom such as N, O, S or Se and examples of which include morpholinyl, piperazinyl, and the like, but are not limited thereto.
  • alkylsilyl refers to a silyl group substituted with an alkyl of 1 to 40 carbon atoms
  • arylsilyl refers to a silyl group substituted with an aryl of 5 to 60 carbon atoms.
  • fused ring refers to a fused aliphatic ring, a fused aromatic ring, a fused heteroaliphatic ring, a heteroaromatic ring, or a combination thereof.
  • the compound represented by Formula 1 of the present invention can be synthesized in various manners with reference to the synthesis procedures of the following Examples.
  • the electron transport layer 305 and the electron injection layer 306 act to migrate electrons injected from cathode 200 into the light-emitting layer 303.
  • a material for the electron transport layer 305 or the electron injection layer 306 is nor particularly limited if it readily allows electron injection and is of large electron motility. Non-limitative examples of the material include compounds represented by Formula 1, anthracene derivatives, heteroaromatic compounds, and alkali metal complexes.
  • the electron transport layer 305 and/or the electron injection layer 306 is particularly made of the same material as the lifetime enhancement layer 304, that is, a compound represented by Formula 1.
  • the electron transport layer 305 and/or the electron injection layer 306 may be codeposited with alkali metal complexes so as to facilitate the injection of electrons from the cathode.
  • the alkali metal complexes may be based on alkali metals, alkaline earth metals, or rare earth metals.
  • the organic layer according to one embodiment of the present invention may further comprise an organic film layer (not shown), disposed between the hole transport layer 302 and the light emitting layer 303, for blocking electrons and excitons.
  • the organic film layer is provided with a high LUMO value so as to block the migration of electrons into the hole transport layer 302 and with high triplet energy so as to prevent the excitons of the light-emitting layer 303 into the hole transport layer 302.
  • No particular limitations are imparted to the material for the organic film layer, and non-limitative examples of the material include carbazole derivatives and arylamine derivatives.
  • the preparation method of the organic layer 300 according to one embodiment of the present invention is not particularly limited, and may be a vacuum evaporation method or a solution coating method as a non-limitative example.
  • the solution coating method include spin coating, dip coating, doctor blading, inkjet printing, and a thermal transfer method.
  • the organic electroluminescent element has a structure in which the anode 100, an organic layer 300, and a cathode 200 are sequentially deposited, and may further comprise an insulating layer or an adhesive layer between the anode 100 and the organic layer 300 or between the cathode 200 and the organic layer 300.
  • the organic electroluminescent element can prolong the time taken for initial luminance to decrease half (life time) while maintaining the maximum emission efficiency, so that the organic electroluminescent element exhibits excellent lifespan properties.
  • a glass substrate coated with an ITO (indium tin oxide) thin film 1500 ⁇ thick was cleansed by ultrasonication in distilled water and then in a solvent such as isopropyl alcohol, acetone, methanol, etc. and then dried.
  • the glass substrate was transferred to a UV OZONE cleaner (Power sonic 405, Hwashin Tech) and cleaned for 5 min using UV, and transferred to a vacuum evaporator.
  • a UV OZONE cleaner Power sonic 405, Hwashin Tech
  • a hole injection layer, a hole transport layer, a light-emitting layer, a lifetime enhancement layer, an electron transport layer, an electron injection layer, and a cathode were deposited in that order to fabricate organic electroluminescent elements. Structures of the fabricated elements are as shown in Table 2, below. TABLE 2 Hole injection layer Hole transport layer Light-emitting layer Lifetime Enhancement Layer Electron transport layer Cathode Cpd. DS-205 (Doosan Corporation) NPB AND +5% DS-405 (Doosan Corporation) LE-01 to LE-12 Alq 3 Al Thick. 80nm 15nm 30nm 5nm 25nm 200nm
  • An element was fabricated in the same manner as in Example 1, with the exception that an electron transport layer 30 nm thick was vapor deposited without employing a lifetime enhancement layer.
  • a glass substrate coated with an ITO (indium tin oxide) thin film 1500 ⁇ thick was cleansed by ultrasonication in distilled water and then in a solvent such as isopropyl alcohol, acetone, methanol, etc. and then dried.
  • the glass substrate was transferred to a UV OZONE cleaner (Power sonic 405, Hwashin Tech) and cleaned for 5 min using UV, and transferred to a vacuum evaporator.
  • a UV OZONE cleaner Power sonic 405, Hwashin Tech
  • a hole injection layer, a hole transport layer, a light-emitting layer, a lifetime enhancement layer, an electron transport layer, an electron injection layer, and a cathode were deposited in that order to fabricate organic electroluminescent elements. Structures of the fabricated elements are as shown in Table 4, below. TABLE 4 Hole injection layer Hole transport layer Light-Emitting layer Lifetime Enhancement Layer Electron transport layer Electron injection layer Cathode Cpd. m-MTDATA TCTA CBP+10% Ir (ppy) 3 as shown in Table 5, below Alq 3 LiF Al Thick. 60nm 80nm 30nm 5nm 25nm 1nm 200nm
  • An element was fabricated in the same manner as in Example 1, with the exception that an electron transport layer 30 nm thick was vapor deposited without employing a lifetime enhancement layer.
  • Example 13 Current Efficiency (cd/A) Emitting Peak (nm) Lifespan (hr, T 97 )
  • Example 13 LE-01 6.4 37.0 516 51
  • Example 14 LE-02 6.1 38.8 516 53
  • Example 15 LE-04 6.2 38.0 516 57
  • Example 16 LE-05 6.4 39.0 517 58
  • Example 17 LE-06 6.1 36.6 516 69
  • Example 18 LE-07 6.0 41.5 515 61
  • Example 19 LE-08 6.4 40.6 516 63
  • Example 20 LE-10 6.8 37.8 516 89 C.
  • Example 4 BCP 7.9 40.2 516 40 *For lifespan, a measurement was made of time taken for luminance to decrease to 97 % of the initial value thereof, using a lifetime test system (McScience).

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Claims (13)

  1. Elément électroluminescent organique, comprenant : une anode ; une cathode ; et une couche organique interposée entre les deux, dans lequel la couche organique comprend une couche émettrice de lumière, une couche de transport d'électrons et une couche d'augmentation de durée de vie interposée entre la couche émettrice de lumière et la couche de transport d'électrons,
    la couche d'augmentation de durée de vie comprend un composé représenté par la formule 1 suivante :
    Figure imgb0070
     dans laquelle,
    Ra et Rb sont identiques ou différents l'un de l'autre et sont chacun indépendamment choisis dans le groupe constitué par un groupe alkyle en C1 à C40 et un groupe aryle en C6 à C60, ou se combinent l'un avec l'autre pour former un cycle condensé,
    R1 à R3 sont identiques ou différents l'un de l'autre et sont chacun indépendamment choisis dans le groupe constitué par un atome d'hydrogène, de deutérium, d'halogène, un groupe cyano, un groupe nitro, un groupe amino, un groupe alkyle en C1 à C40, un groupe alcényle en C2 à C40, un groupe alcynyle en C2 à C40, un groupe cycloalkyle en C3 à C40, un groupe hétérocycloalkyle ayant 3 à 40 atomes nucléaires, un groupe aryle en C6 à C60, un groupe hétroaryle ayant 5 à 60 atomes nucléaires, un groupe alkyloxy en C1 à C40, un groupe aryloxy en C6 à C60, un groupe alkylsilyle en C1 à C40, un groupe arylsilyle en C6 à C60, un groupe alkylbore en C1 à C40, un groupe arylbore en C6 à C60, un groupe phosphine en C1 à C40, un groupe oxyde de phosphine en C1 à C40 et un groupe arylamine en C6 à C60, ou chacun de R1 à R3 forme un cycle fondu quand il est combiné avec un adjacent, à la condition qu'un groupe hétéroaryle ayant 5 à 60 atomes nucléaires soit exclu pour R3,
    L est choisi dans le groupe constitué par une simple liaison, un groupe arylène en C6 à C18 et un groupe hétéroarylène ayant 5 à 18 atomes nucléaires,
    Z1 à Z5 sont identiques ou différents les uns des autres et sont chacun indépendamment N ou un groupe C(R4), pourvu qu'au moins un de Z1 à Z5 soit N, et quand C(R4) est présent en nombre pluriel, ils sont identiques l'un de l'autre,
    c et e sont chacun un nombre entier de 0 à 4,
    d est un nombre entier de 0 à 3,
    m et n sont chacun un nombre entier de 1 à 3,
    R4 est choisi dans le groupe constitué par un atome d'hydrogène, de deutérium, d'halogène, un groupe cyano, un groupe nitro, un groupe amino, un groupe alkyle en C1 à C40, un groupe alcényle en C2 à C40, un groupe alcynyle en C2 à C40, un groupe cycloalkyle en C3 à C40, un groupe hétérocycloalkyle ayant 3 à 40 atomes nucléaires, un groupe aryle en C6 à C60, un groupe hétéroaryle ayant 5 à 60 atomes nucléaires, un groupe alkyloxy en C1 à C40, un groupe aryloxy en C6 à C60, un groupe alkylsilyle en C1 à C40, un groupe arylsilyle en C6 à C60, un groupe alkylbore en C1 à C40, un groupe arylbore en C6 à C60, un groupe phosphine en C1 à C40, un groupe oxyde de phosphine en C1 à C40 et un groupe arylamine en C6 à C60, ou lié à un substituant adjacent pour former un cycle condensé,
    les groupes alkyle et aryle de Ra et Rb, les groupes alkyle, alcényle, alcynyle, cycloalkyle, hétérocycloalkyle, aryle, hétéroaryle, alkyloxy, aryloxy, alkylsilyle, arylsilyle, alkylbore, arylbore, phosphine, oxyde de phosphine et arylamine de R1 à R4 et les groupes arylène et hétéroarylène de L peuvent être chacun indépendamment non substitués ou substitués avec au moins un substituant choisi dans le groupe constitué par un atome de deutérium, d'halogène, un groupe cyano, un groupe nitro, un groupe amino, un groupe alkyle en C1 à C40, un groupe alcényle en C2 à C40, un groupe alcynyle en C2 à C40, un groupe cycloalkyle en C3 à C40, un groupe hétérocycloalkyle ayant 3 à 40 atomes nucléaires, un groupe aryle en C6 à C60, un groupe hétéroaryle ayant 5 à 60 atomes nucléaires, un groupe alkyloxy en C1 à C40, un groupe aryloxy en C6 à C60, un groupe alkylsilyle en C1 à C40, un groupe arylsilyle en C6 à C60, un groupe alkylbore en C1 à C40, un groupe arylbore en C6 à C60, un groupe phosphine en C1 à C40, un groupe oxyde de phosphine en C1 à C40 et un groupe arylamine en C6 à C60, pourvu que quand le substituant est présent en nombre pluriel, ils sont identiques ou différents les uns des autres, à la condition que le groupe aryle substitué avec un groupe hétéroaryle ayant 5 à 6 atomes nucléaires soit exclu pour R4, et pourvu que quand la structure (substituant) représentée par
    Figure imgb0071
     (* est un site où se lier avec L) est la structure représentée par le C-9 suivant, les R4 sont identiques l'un à l'autre :
    Figure imgb0072
  2. Elément électroluminescent organique selon la revendication 1, dans lequel la couche organique comprend au moins une choisie dans le groupe constitué par une couche d'injection de trous, une couche de transport de trous et une couche d'injection d'électrons, et
    au moins une de la couche de transport d'électrons et de la couche d'injection d'électrons contient le composé représenté par la formule 1.
  3. Elément électroluminescent organique selon la revendication 1, dans lequel la couche émettrice de lumière contient un matériau phosphorescent vert, et
    le composé, représenté par la formule 1, contenu dans la couche d'augmentation de durée de vie a un potentiel d'ionisation de 6,0 eV ou plus et une énergie de triplet de 2,5 eV ou plus.
  4. Elément électroluminescent selon la revendication 1, dans lequel la couche émettrice de lumière contient un matériau phosphorescent bleu et
    le composé, représenté par la formule 1, contenu dans la couche d'augmentation de durée de vie a un potentiel d'ionisation de 6,0 eV ou plus et une énergie de triplet de 2,7 eV ou plus.
  5. Elément électroluminescent selon la revendication 2, dans lequel la couche de transport d'électrons contient un composé représenté par la formule 1,
    la couche d'augmentation de durée de vie contient un composé représenté par la formule 1, et
    les composés respectifs contenus dans la couche de transport d'électrons et la couche d'augmentation de durée de vie sont identiques.
  6. Elément électroluminescent selon la revendication 2, dans lequel la couche d'injection d'électrons contient un composé représenté par la formule 1,
    la couche d'augmentation de durée de vie contient un composé représenté par la formule 1, et
    les composés respectifs contenus dans la couche d'injection d'électrons et la couche d'augmentation de durée de vie sont identiques.
  7. Elément électroluminescent selon la revendication 1, dans lequel le composé représenté par la formule 1 a un potentiel d'ionisation de 5,5 eV ou plus, un espace entre HOMO et LUMO de plus de 3,0 eV, une énergie de triplet de 2,3 eV ou plus, et un espace entre l'énergie de singlet et l'énergie de triplet de moins de 0,7 eV.
  8. Elément électroluminescent selon la revendication 1, dans lequel le composé de formule 1 a une motilité de trou de 1×10-6cm2/V·s ou plus et une motilité d'électron de 1×10-6cm2/V·s ou plus à température ambiante
  9. Elément électroluminescent selon la revendication 1, dans lequel le composé représenté par la formule 1 est choisi dans le groupe constitué par des composés respectifs représentés par les formules 2 à 4 suivantes :
    Figure imgb0073
    Figure imgb0074
    Figure imgb0075
     dans lesquelles,
    Ra, Rb, R1 à R3, Z1 à Z5, c, d et e sont chacun identiques à ceux définis dans la revendication 1.
  10. Composé électroluminescent organique selon la revendication 1, dans lequel la structure (substituant) représentée par
    Figure imgb0076
     (* est un site où se lier avec L) dans la formule 1 est choisie dans le groupe constitué par les structures représentées par les C-1 à C-8 et C-10 à C-15 suivants :
    Figure imgb0077
    Figure imgb0078
    Figure imgb0079
    Figure imgb0080
    Figure imgb0081
    R4 est identique à celui défini dans la revendication 1,
    R5 est choisi dans le groupe constitué par un atome d'hydrogène, de deutérium, d'halogène, un groupe cyano, un groupe nitro, un groupe alkyle en C1 à C40, un groupe alcényle en C2 à C40, un groupe alcynyle en C2 à C40, un groupe cycloalkyle en C3 à C40, un groupe hétérocycloalkyle ayant 3 à 40 atomes nucléaires, un groupe aryle en C6 à C60, un groupe hétéroaryle ayant 5 à 60 atomes nucléaires, un groupe aryloxy en C6 à C60, un groupe alkyloxy en C1 à C40, un groupe arylamine en C6 à C60, un groupe alkylsilyle en C1 à C40, un groupe alkylbore en C1 à C40, un groupe arylbore en C6 à C60, un groupe arylphosphine en C6 à C60, un groupe oxyde d'arylphosphine en C6 à C60 et un groupe arylsilyle en C6 à C60, ou lié à un substituant adjacent pour former un cycle fondu, et
    p est un nombre entier de 1 à 4,
    les groupes alkyle, alcényle, alcynyle, cycloalkyle, hétérocycloalkyle, aryle, hétéroaryle, aryloxy, alkyloxy, arylamine, alkylsilyle, alkylbore, arylbore, arylphosphine, oxyde d'arylphosphine et arylsilyle de R5 peuvent être chacun indépendamment non substitués ou substitués avec au moins un substituant choisi dans le groupe constitué par un atome de deutérium, d'halogène, un groupe cyano, un groupe nitro, un groupe alkyle en C1 à C40, un groupe alcényle en C2 à C40, un groupe alcynyle en C2 à C40, un groupe aryle en C6 à C60, un groupe hétéroaryle ayant 5 à 60 atomes nucléaires, un groupe aryloxy en C6 à C60, un groupe alkyloxy en C1 à C40, un groupe aryl amine en C6 à C60, un groupe cycloalkyle en C3 à C40, un groupe hétérocycloalkyle ayant 3 à 40 atomes nucléaires, un groupe alkylsilyle en C1 à C40, un groupe alkylbore en C1 à C40, un groupe arylbore en C6 à C60, un groupe arylphosphine en C6 à C60, un groupe oxyde d'arylphosphine en C6 à C60 et un groupe arylsilyle en C6 à C60, pourvu que quand le substituant est présent en nombre pluriel, ils sont identiques ou différents les uns des autres.
  11. Elément électroluminescent selon la revendication 1, dans lequel Ra et Rb sont identiques ou différents l'un de l'autre et sont chacun indépendamment un groupe méthyle ou un groupe phényle ou se lient l'un à l'autre pour former un cycle condensé représenté par
    Figure imgb0082
     (* est un site où se lier).
  12. Elément électroluminescent selon la revendication 1, dans lequel L est choisi dans le groupe constitué par les structures représentées par les L-1 à L-9 suivants (* est un site où se lier) :
    Figure imgb0083
    Figure imgb0084
  13. Elément électroluminescent organique selon la revendication 1, dans lequel le composé représenté par la formule 1 est choisi dans le groupe constitué par des composés représentés par les formules LE-01 à LE-12 suivantes :
    Figure imgb0085
    Figure imgb0086
    Figure imgb0087
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KR20160078241A (ko) 2016-07-04
KR20170016905A (ko) 2017-02-14
US20200185618A1 (en) 2020-06-11
EP3753928B1 (fr) 2025-12-17
US20200185617A1 (en) 2020-06-11
KR101745799B1 (ko) 2017-06-09
EP3239271A1 (fr) 2017-11-01
CN107108504B (zh) 2020-12-18
KR20160078237A (ko) 2016-07-04
JP6735753B2 (ja) 2020-08-05
JP2020004992A (ja) 2020-01-09
JP6633637B2 (ja) 2020-01-22
EP3789381A1 (fr) 2021-03-10
KR102587500B1 (ko) 2023-10-11
US20180053900A1 (en) 2018-02-22
KR20170016906A (ko) 2017-02-14
EP3798210A1 (fr) 2021-03-31
EP3789381B1 (fr) 2024-03-27
KR102384656B1 (ko) 2022-04-27
KR20190039056A (ko) 2019-04-10
KR102611317B1 (ko) 2023-12-07
EP3753928A1 (fr) 2020-12-23
KR20190039058A (ko) 2019-04-10
KR20160078251A (ko) 2016-07-04
US11832514B2 (en) 2023-11-28
EP3239136A4 (fr) 2018-07-18
EP3798210B1 (fr) 2025-04-02
CN111689916A (zh) 2020-09-22
CN107108529B (zh) 2021-08-06
EP3239136A2 (fr) 2017-11-01
EP3239271A4 (fr) 2018-10-03
KR20160078238A (ko) 2016-07-04
EP3660006A1 (fr) 2020-06-03
KR20190039057A (ko) 2019-04-10
KR102507369B9 (ko) 2024-09-26
KR102123759B9 (ko) 2020-06-16
CN111689906A (zh) 2020-09-22
KR101737298B1 (ko) 2017-05-17
EP3660006B1 (fr) 2023-10-25
CN107108529A (zh) 2017-08-29
US11997924B2 (en) 2024-05-28
KR20190039059A (ko) 2019-04-10
KR101861474B1 (ko) 2018-05-28
US9960363B2 (en) 2018-05-01
KR102339570B1 (ko) 2021-12-17
JP2018507174A (ja) 2018-03-15
US20180013072A1 (en) 2018-01-11
KR102507369B1 (ko) 2023-03-08
EP3239136B1 (fr) 2023-06-07
KR102123759B1 (ko) 2020-06-16
KR102324319B1 (ko) 2021-11-11
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US10916709B2 (en) 2021-02-09
JP6825195B2 (ja) 2021-02-03
JP2018506847A (ja) 2018-03-08
KR20180043220A (ko) 2018-04-27
KR102350318B1 (ko) 2022-01-18
CN111689906B (zh) 2023-07-25

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